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US9156539B2 - Aircraft window member, method of manufacturing the same, and aircraft window assembly - Google Patents

Aircraft window member, method of manufacturing the same, and aircraft window assembly Download PDF

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Publication number
US9156539B2
US9156539B2 US12/525,912 US52591208A US9156539B2 US 9156539 B2 US9156539 B2 US 9156539B2 US 52591208 A US52591208 A US 52591208A US 9156539 B2 US9156539 B2 US 9156539B2
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US
United States
Prior art keywords
film
conductive mesh
window
main body
aircraft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US12/525,912
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English (en)
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US20100304069A1 (en
Inventor
Kazuyuki Oguri
Katsuto Okada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., FUJIWARA CO., LTD. reassignment MITSUBISHI HEAVY INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OGURI, KAZUYUKI, OKADA, KATSUTO
Publication of US20100304069A1 publication Critical patent/US20100304069A1/en
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD. reassignment MITSUBISHI HEAVY INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUJIWARA CO., LTD.
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Publication of US9156539B2 publication Critical patent/US9156539B2/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
    • B64C1/14—Windows; Doors; Hatch covers or access panels; Surrounding frame structures; Canopies; Windscreens accessories therefor, e.g. pressure sensors, water deflectors, hinges, seals, handles, latches, windscreen wipers
    • B64C1/1476—Canopies; Windscreens or similar transparent elements
    • B64C1/1484—Windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D45/00—Aircraft indicators or protectors not otherwise provided for
    • B64D45/0015—Devices specially adapted for the protection against criminal attack, e.g. anti-hijacking systems
    • B64D45/0063—Devices specially adapted for the protection against criminal attack, e.g. anti-hijacking systems by avoiding the use of electronic equipment during flight, e.g. of mobile phones or laptops
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0086—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single discontinuous metallic layer on an electrically insulating supporting structure, e.g. metal grid, perforated metal foil, film, aggregated flakes, sintering
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0094—Shielding materials being light-transmitting, e.g. transparent, translucent
    • B64D2045/006—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]

Definitions

  • the present invention relates to an aircraft window member, a method of manufacturing the same, and an aircraft window assembly.
  • aircraft window members are frequently used for canopies and cabin windows, for example. Endowing such aircraft window members with electromagnetic-wave shielding properties has been examined in order to avoid penetration of harmful electromagnetic waves from the outside of the aircraft or to prevent electromagnetic waves originating in the aircraft from leaking to the outside.
  • Japanese Unexamined Patent Application, Publication No. 2005-104310 discloses a manufacturing method in which a metal mesh for electromagnetic-wave shielding is formed on a film and is then attached to a window main body.
  • PET polyethylene terephthalate
  • Acrylic resin is used for the window main body of each of the aircraft window members, and acrylic resin and PET have a large difference in thermal expansion coefficient. Therefore, when heat treatment is applied after the film is attached to the window main body, wrinkles may occur due to the difference in thermal expansion coefficient. Furthermore, the film may be peeled from the window main body during the operation of the aircraft because of a large temperature difference between when it is on the ground and when it is flying, which is undesirable in terms of durability.
  • the present invention has been made in view of those circumstances, and an object of the present invention is to provide an aircraft window member excellent in durability, a method of manufacturing the same, and an aircraft window assembly.
  • the aircraft window member, the method of manufacturing the same, and the aircraft window assembly of the present invention employ the following solutions.
  • an aircraft window member includes: a film made of acrylic resin; a conductive mesh which is formed on the film and in which a conductive material is formed in a mesh shape so as to have optical transparency for ensuring visibility and to have electromagnetic-wave shielding properties; and a window main body which is made of acrylic resin and to which the film on which the conductive mesh is formed is attached.
  • the window main body and the film are made of acrylic resin, they have an equivalent thermal expansion coefficient. Therefore, even when they are heated and cooled during manufacturing, hardly any wrinkles occur. Furthermore, although the aircraft window member is exposed to a large change in temperature during the operation of the aircraft, since there is no difference in thermal expansion coefficient between the window main body and the film, peeling of the film almost never occurs, thus improving the durability.
  • the aircraft window member according to the present invention may have a configuration in which an adhesive layer is formed between the film on which the conductive mesh is formed and the window main body; and the adhesive layer is made of urethane adhesive.
  • PVB polyvinyl butyral
  • urethane adhesive has sufficient adhesive strength to bond the film made of acrylic resin to the window main body made of acrylic resin. It is preferable that film-like polyurethane be used as the urethane adhesive used in the present invention.
  • the conductive mesh formed on the film may be located between the film and the window main body.
  • the conductive mesh formed on the film is located between the film and the window main body, the conductive material of the conductive mesh and the adhesive layer are brought into direct contact.
  • Urethane adhesive is used as the adhesive layer, and the urethane adhesive does not include plasticizer, unlike PVB. Therefore, a reaction does not occur between the conductive material of the conductive mesh and the adhesive layer, and there is no adverse influence on the optical transparency of the window member.
  • the aircraft window member according to the present invention may have a configuration in which the conductive mesh is located above the window main body with the film therebetween; and a protective layer is formed on the conductive mesh in such a manner as to provide an exposed region used for an electrical connection at an edge portion of the conductive mesh.
  • the protective layer When the conductive mesh formed on the film does not face the window main body but is located at the side opposite to the window main body with the film therebetween, it is necessary to laminate the protective layer to protect the conductive mesh. If the exposed region which is not covered with the protective layer is provided at the edge portion of the conductive mesh when the protective layer is laminated, it is possible to obtain an electrical connection for electromagnetic-wave shielding by using the exposed region for the electrical connection.
  • an aircraft window assembly includes: any of the aircraft window members described above; and a window frame which holds the aircraft window member.
  • the aircraft window assembly excellent in durability can be provided.
  • an aircraft-window-member manufacturing method includes attaching a film that is made of acrylic resin and that holds a conductive mesh in which a conductive material is formed in a mesh shape so as to have optical transparency for ensuring visibility and to have electromagnetic-wave shielding properties, to a window main body made of acrylic resin.
  • the aircraft window member can be simply manufactured just by attaching the film to the window main body. Even when the window main body has a curved face, the film can be easily attached thereto because the film has flexibility.
  • the window main body and the film are made of acrylic resin, they have an equivalent thermal expansion coefficient. Therefore, even when they are heated and cooled during manufacturing, hardly any wrinkles occur. Furthermore, although the aircraft window member is exposed to a large change in temperature during the operation of the aircraft, since there is no difference in the thermal expansion coefficient between the window main body and the film, peeling of the film almost never occurs, thus improving the durability.
  • the film may be attached to the window main body after an adhesive layer made of urethane adhesive is provided on the window main body.
  • PVB polyvinyl butyral
  • urethane adhesive has sufficient adhesive strength to bond the film made of acrylic resin to the window main body made of acrylic resin.
  • the film may be attached to the window main body so as to locate the conductive mesh between the film and the window main body.
  • the conductive mesh formed on the film is located between the film and the window main body, the conductive material of the conductive mesh and the adhesive layer are brought into direct contact.
  • Urethane adhesive is used as the adhesive layer, and the urethane adhesive does not include plasticizer, unlike PVB. Therefore, a reaction does not occur between the conductive material of the conductive mesh and the adhesive layer, and there is no adverse influence on the optical transparency of the window member.
  • the aircraft-window-member manufacturing method according to the present invention may have a configuration in which the film is attached to the window main body so as to locate the conductive mesh above the window main body with the film therebetween; and a protective layer is formed on the conductive mesh in such a manner as to provide an exposed region used for an electrical connection at an edge portion of the conductive mesh.
  • the window main body and the film are made of acrylic resin, an aircraft window member having high durability can be provided.
  • urethane adhesive is used to bond the film and the window main body, they can be firmly bonded. Even when the adhesive layer and the conductive layer are brought into direct contact, the transmittance for ensuring visibility is not reduced.
  • the exposed region is provided at the edge portion of the conductive mesh so as to obtain an electrical connection. Therefore, electromagnetic waves can be reliably shielded.
  • FIG. 1 is a perspective view showing an aircraft window member according to a first embodiment of the present invention.
  • FIG. 2 is a partial cross-sectional view showing an edge portion of the aircraft window member shown in FIG. 1 .
  • FIG. 3 is a cross-sectional view showing part of a process of manufacturing the aircraft window member shown in FIG. 2 .
  • FIG. 4 is a partial cross-sectional view showing an edge portion of an aircraft window member according to a second embodiment of the present invention.
  • FIGS. 1 to 3 A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3 .
  • FIG. 1 shows an aircraft window member used for a cabin window, for example. Note that an aircraft window member 1 shown in FIG. 1 is flat, but it may be curved depending on the position at which it is installed.
  • the aircraft window member 1 includes a window main body 3 serving as a base, a film 5 attached to the window main body 3 , and a conductive mesh 7 formed on the film 5 .
  • the aircraft window member 1 has electromagnetic-wave shielding properties and also has optical transparency to ensure visibility. For example, the transmittance for visible light is about 90%.
  • FIG. 2 is a partial cross-sectional view showing an edge portion of the aircraft window member 1 .
  • the film 5 and the conductive mesh 7 are laminated in this order on the window main body 3 , with an adhesive layer 9 therebetween.
  • the window main body 3 is made of acrylic resin, more specifically, polymethyl methacrylate resin (PMMA).
  • PMMA polymethyl methacrylate resin
  • the film 5 is made of acrylic resin, more specifically, polymethyl methacrylate resin (PMMA). In short, the same material as for the window main body 3 is used for the film 5 .
  • the thickness of the film 5 is 125 ⁇ m, for example.
  • the conductive mesh 7 is formed in a lattice.
  • a preferable conductive material therefor is metal, and copper is used in this embodiment.
  • the line width of the conductive mesh 7 is about 10 ⁇ m, the thickness thereof is about 10 ⁇ m, and the pitch thereof is about 300 ⁇ m. Such a line width, thickness, and pitch achieve both of electromagnetic-wave shielding properties and visibility.
  • the adhesive layer 9 is made of urethane adhesive. Film-like polyurethane is used as the urethane adhesive. After bonding, the adhesive layer 9 flows into the space between the film 5 and the conductive mesh and directly contacts the conductive material (copper) of the conductive mesh 7 to cover the region therearound.
  • a copper thin film is laminated on one face of the film 5 by a plating method, for example.
  • the thickness of the copper thin film is 10 ⁇ m, for example.
  • a resist film is formed on the surface of the copper thin film.
  • the resist film is exposed to light with a resist pattern and is then developed to form a mesh-shaped mask on the surface of the copper thin film.
  • the copper is etched by using etchant and then the resist pattern is removed, thereby forming the mesh-shaped conductive mesh 7 .
  • the film 5 having the conductive mesh 7 is obtained as indicated by reference numerals 5 and 7 in FIG. 3 .
  • the film 5 is attached such that the conductive mesh 7 faces the window main body 3 .
  • the treatment conditions using the autoclave are set as follows: the temperature is 85° C. to 95° C., the pressure is 1.03 MPa, and the treatment time is 1 hour.
  • the aircraft window member 1 is obtained after being taken out from the autoclave and cooled.
  • the aircraft window member 1 manufactured as described above, is then fitted into a window frame or the like, thereby obtaining an aircraft window assembly.
  • the aircraft window member 1 can be simply manufactured just by attaching the film 5 on which the conductive mesh 7 is formed to the window main body 3 . Even when the window main body 3 has a curved face, since the film 5 on which the conductive mesh 7 is formed has flexibility, the film 5 can be easily attached to the window main body 3 .
  • the window main body 3 and the film 5 are made of acrylic resin to have an equivalent thermal expansion coefficient, hardly any wrinkles occur on the film 5 even when they are heated by the autoclave during manufacturing and cooled thereafter.
  • the aircraft window member 1 is exposed to a large change in temperature during the operation of the aircraft, since there is no difference in thermal expansion coefficient between the window main body 3 and the film 5 , peeling of the film almost never occurs, thus improving the durability.
  • urethane adhesive is used as the adhesive layer 9 , it is possible to firmly bond the window main body 3 and the film 5 , which are made of acrylic resin.
  • urethane adhesive does not include plasticizer, unlike polyvinyl butyral (PVB), even when it directly contacts the copper of the conductive mesh 7 , a reaction does not occur and there is no adverse influence on the optical transparency of the window member.
  • FIG. 4 is a partial cross-sectional view showing an edge portion of an aircraft window member 1 ′ according to this embodiment.
  • the conductive mesh 7 faces upward in FIG. 4 , instead of facing the window main body 3 . Therefore, the window main body 3 , the adhesive layer 9 , the film 5 , and the conductive mesh 7 are laminated in this order from the bottom in FIG. 4 . Since the materials and the shapes of the window main body 3 , the adhesive layer 9 , the film 5 , and the conductive mesh 7 are the same as those in the first embodiment, a description thereof will be omitted.
  • a protective layer 11 for protecting the conductive mesh is laminated on the conductive mesh 7 .
  • a film made of acrylic resin is used as the protective layer 11 .
  • the conductive mesh 7 and the protective layer 11 are bonded by polyvinyl acetate adhesive.
  • An exposed region 13 which is not covered with the protective layer 11 is provided at an edge portion of the conductive mesh 7 .
  • the exposed region 13 is used to obtain an external electrical connection when the aircraft window member 1 ′ is fitted into a window frame to form a window assembly.
  • the aircraft window member 1 ′ having the above-described structure is manufactured as follows.
  • the protective layer 11 is attached to the conductive mesh 7 formed on the film 5 .
  • the film 5 on which the conductive mesh 7 is formed is attached to the window main body 3 .
  • the film 5 is brought into contact with the adhesive layer 9 , with the conductive mesh 7 facing upward in FIG. 4 instead of facing the window main body 3 .
  • the adhesive layer 9 is thermally-hardened by the autoclave and cooled, thereby obtaining the aircraft window member 1 ′.
  • the aircraft window member 1 ′ thus manufactured is then fitted into a window frame or the like, thereby obtaining an aircraft window assembly.
  • the exposed region 13 which is not covered with the protective layer 11 , is provided at the edge portion of the conductive mesh 7 when the protective layer 11 is laminated on the conductive mesh 7 , the exposed region can be used for an electrical connection. Therefore, when the aircraft window member 1 ′ is fitted into a window frame to form an aircraft window assembly, it is possible to obtain an external electrical connection to reliably shield electromagnetic waves.
  • copper is used as the material of the conductive mesh 7 .
  • the present invention is not limited to the use of copper.
  • gold, silver, aluminum, nickel, titanium, or tin may be used.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
US12/525,912 2007-02-19 2008-02-18 Aircraft window member, method of manufacturing the same, and aircraft window assembly Expired - Fee Related US9156539B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2007-037858 2007-02-19
JP2007037858A JP4969268B2 (ja) 2007-02-19 2007-02-19 航空機用窓材およびその製造方法
PCT/JP2008/052676 WO2008102737A1 (fr) 2007-02-19 2008-02-18 Élément de hublot d'avion, son procédé de fabrication et élément de hublot d'avion

Publications (2)

Publication Number Publication Date
US20100304069A1 US20100304069A1 (en) 2010-12-02
US9156539B2 true US9156539B2 (en) 2015-10-13

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US12/525,912 Expired - Fee Related US9156539B2 (en) 2007-02-19 2008-02-18 Aircraft window member, method of manufacturing the same, and aircraft window assembly

Country Status (8)

Country Link
US (1) US9156539B2 (fr)
EP (1) EP2123554B1 (fr)
JP (1) JP4969268B2 (fr)
CN (1) CN101610948B (fr)
BR (1) BRPI0808019B1 (fr)
CA (1) CA2678099C (fr)
RU (1) RU2409500C1 (fr)
WO (1) WO2008102737A1 (fr)

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EP2123554A4 (fr) 2013-02-20
US20100304069A1 (en) 2010-12-02
EP2123554A1 (fr) 2009-11-25
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EP2123554B1 (fr) 2014-04-16

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